1) why do we add salt to the ice?
to make ice not melting or turn to water quickly
2) why do we add the cookies and other things, only after the milk has frozen slightly?
to make cookie and other things freeze with milk easily
3) what are two factors that affect the freezing you think?
salt and shaking
4) why do you need a bit of air in the bag?
to make milk turn frozen and move around easily